1.

Power due to a force actoing on a block varies with time `t` as shown in figure. Then angle between force acting on the block and its velocity is `:-` A. Obtuse at `t=1s`B. `90^(@)` at `t=3s`C. Acute at `t=7s`D. Both the stones reach the bottom at different times and with different speeds.

Answer» Correct Answer - D
Power, `P=vec(F).vec(v)` so
`P` positive `rArrthetalt90^(@)`, `P` negative `rArrthetagt90^(@)`
and `P` zero `rArrtheta=90^(@)`


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